Iran Closes Strait of Hormuz to All Vessels Following US Strikes
Iran's IRGC has declared the Strait of Hormuz closed to all vessel traffic following US strikes on Iranian targets, with two independent mainstream-media outlets corroborating the closure declaration. One report adds a reported threat to fire on transiting vessels and a reported second strike on the US Fifth Fleet base in Bahrain, while a third reports a >2% intraday jump in crude oil prices. Enforcement scope, duration, naval posture, and US/coalition response remain unconfirmed; no insured loss figure has been reported and the event remains in signal-stage posture.
AI-generated from linked source reports. See our correction policy.
Impact verdict
High impact. Loss pathway: A named, declared closure of the Strait of Hormuz — the waterway carrying roughly 20% of global oil and major LNG flows — directly following US strikes constitutes a concrete maritime and energy disruption with credible spill-over into Marine War, Marine Cargo, Marine Hull, Energy, Political Risk/Political Violence, Aviation War, and downstream treaty exposures. The reported threat to fire on transiting vessels and a reported second strike on the US Fifth Fleet base in Bahrain raise the kinetic risk overlay and support war-risk premium repricing for Persian Gulf transits. Evidence: IRGC announcement reported via independent mainstream-media outlets; a >2% crude price move is an economic-only signal and does not by itself force an insured severity band. Limits: enforcement scope (commercial vs. military), duration, treatment of in-transit traffic, naval posture, and US/coalition response are not yet confirmed; no insured industry loss figure has been reported. The signal warrants elevated war-risk and political-risk vigilance pending confirmation of enforcement and duration.
View assessment methodologyHow we grade what we know -- Known · Reported · Uncertain. Methodology →
Intelligence ledger
Each line expands in place to its underlying sourced claim.
Known11 lines
Iran's IRGC announced closure of the Strait of Hormuz to all vessels▾
Closure is in direct response to US military strikes▾
The IRGC closure declaration is presented by reporting outlets as a direct response to US strikes on Iranian targets.▾
The Strait of Hormuz is a critical chokepoint through which approximately 20% of global oil passes, alongside major LNG flows.▾
The Strait of Hormuz is a critical maritime chokepoint through which approximately 20% of global oil passes daily, alongside major LNG flows.▾
The Strait of Hormuz is a critical maritime chokepoint handling approximately 20% of global oil supply.▾
Iran's Islamic Revolutionary Guard Corps (IRGC) declared the Strait of Hormuz closed to all vessel traffic in direct response to US military strikes on Iranian targets.▾
No insured industry loss figure has been reported for this event.▾
The event is in a signal-stage posture with enforcement scope, duration, and US/coalition response unconfirmed.▾
No insured industry loss figure has been reported; severity is bounded by the existence of a credible disruption to named LoBs rather than by oil-price impact alone.▾
Iran's Islamic Revolutionary Guard Corps (IRGC) has declared the Strait of Hormuz closed to all vessels, in response to reported US military strikes.▾
Reported17 lines
All vessel traffic through the Strait of Hormuz has been halted▾
The reported closure is framed as retaliation for US military strikes on Iranian targets, though US/coalition action details remain unconfirmed.▾
Iran has reportedly warned it will shoot at vessels attempting to transit the Strait of Hormuz during the closure, signalling a kinetic enforcement posture rather than a purely declaratory closure.▾
The IRGC's closure announcement is framed as retaliation for reported US military strikes on Iranian targets, establishing a direct US–Iran military escalation pathway as the trigger for the maritime disruption.▾
No insured industry loss figure has been reported in connection with the Strait of Hormuz closure; the event remains in a signal-stage posture with no quantification of hull, cargo, war, energy or political risk losses at this time.▾
Iran has reportedly struck the US Fifth Fleet base in Bahrain for a second time, raising the regional kinetic overlay and the prospect of further US/coalition military response.▾
The announced closure is framed as retaliation for US military strikes.▾
One mainstream-media report states Iran struck the US Fifth Fleet base in Bahrain for a second time.▾
One mainstream-media report states Iran has warned it will fire on vessels attempting to transit the Strait of Hormuz.▾
Iran is reported to have struck the US Fifth Fleet base in Bahrain for a second time.▾
Iran's IRGC has declared the Strait of Hormuz closed to all vessel traffic in response to US military strikes on Iranian targets.▾
One mainstream-media report records crude oil prices jumping more than 2% intraday following news that Iran had closed the Strait of Hormuz.▾
Crude oil prices jumped more than 2% intraday following reports of the Strait of Hormuz closure.▾
Crude oil prices jumped more than 2% intraday following reports that Iran had closed the Strait of Hormuz to all vessels.▾
A sustained Strait of Hormuz closure would cascade through global energy supply chains given the waterway's central role in oil and LNG flows.▾
War risk premiums for Persian Gulf transits are expected to spike in response to a declared IRGC closure of the Strait of Hormuz.▾
All vessel traffic through the Strait of Hormuz has been reported as halted.▾
Uncertain15 lines
Duration of the closure▾
Whether all naval forces will enforce the blockade▾
Scope of the closure (commercial only or including military)▾
US response and potential for further escalation▾
Impact on existing vessel traffic in transit▾
The scope of the closure (commercial only or including military vessels) remains unconfirmed.▾
Whether all naval forces will enforce the blockade is unconfirmed.▾
US response and the potential for further escalation are unknown.▾
The impact on existing vessel traffic already in transit is unknown.▾
Duration of the announced Strait of Hormuz closure is unconfirmed across reporting.▾
It is unconfirmed whether the announced closure will be physically enforced, and if so, against commercial vessels only, all vessels, or specific flag states; whether other naval forces will enforce or contest a blockade is also unconfirmed.▾
US and coalition response, including any naval posture changes, freedom-of-navigation operations, or further strikes, is unconfirmed.▾
The US and coalition response to the IRGC closure declaration, and the potential for further escalation, has not been confirmed in the available reporting.▾
It is unconfirmed how vessels already in transit through the Strait of Hormuz at the time of the closure declaration are being treated, and what diversion or safe-passage arrangements, if any, are in place.▾
It is uncertain whether the closure applies to all naval forces or only commercial traffic, and whether in-transit vessels will be affected.▾
Geographic Zone Matches
14 active matches
- Oman (12nm coastal buffer)Rule-basedConfidence 100%
- OFAC Sanctioned CountriesRule-basedConfidence 100%
- United Arab Emirates (12nm coastal buffer)Rule-basedConfidence 100%
- TRIA Certified AreasRule-basedConfidence 100%
- JWC Listed AreasRule-basedConfidence 100%
- Kuwait (12nm coastal buffer)Rule-basedConfidence 100%
- EU Sanctions ListRule-basedConfidence 100%
- Iran (12nm coastal buffer)Rule-basedConfidence 100%
- Saudi Arabia (12nm coastal buffer)Rule-basedConfidence 100%
- Bahrain (12nm coastal buffer)Rule-basedConfidence 100%
- Qatar (12nm coastal buffer)Rule-basedConfidence 100%
- Pacific Ring of FireRule-basedConfidence 100%
- Persian/Arabian Gulf, Gulf of Oman, Indian Ocean, Gulf of Aden and Southern Red SeaRule-basedConfidence 100%
- Caribbean Hurricane ZoneRule-basedConfidence 100%
Geographic zone matches are RiskEvents spatial/analytical indicators, not coverage determinations or Lloyd's official classifications.
Affected countries
+3 more
Latest developments
- IRGC declares Strait of Hormuz closed to all vessel traffic following US strikes on Iran. — balkanweb.com
- Reporting attributes the closure to a direct response to US strikes on Iran. — balkanweb.com
- One report carries a reported IRGC threat to fire on transiting vessels (single-sourced). — indiatimes.com
- One report carries a claimed second Iranian strike on the US Fifth Fleet base in Bahrain (single-sourced). — indiatimes.com
- One report records a >2% intraday jump in crude oil prices tied to the closure announcement. — indiatimes.com
- Reporting identifies the Strait of Hormuz as a critical chokepoint carrying roughly 20% of global oil and major LNG flows. — indiatimes.com
- Duration of the closure has not been confirmed. — indiatimes.com
- Enforcement scope and any naval contestation have not been confirmed. — indiatimes.com
Timeline
Reports indicate a US military strike on Iran has prompted Tehran to close the Strait of Hormuz, a critical chokepoint for global oil and LNG shipments. Closure of this waterway would have immediate and severe implications for energy supply chains, marine cargo and hull war risk, and political risk/trade disruption lines. This represents a major escalation with direct insured-asset and pricing implications across multiple London Market books.
Source: balkanweb.com (Mainstream Media) · View source
Status changed to monitoring
Auto-transitioned: no updates for 6 hours
active -> monitoring
Status changed to active
evidence_trigger: developing_promotion
developing -> active
Iran has launched attacks on Bahrain and Kuwait and closed the Strait of Hormuz to all shipping following fresh US military strikes. The closure of this critical chokepoint through which approximately 20% of global oil flows represents an extreme marine and energy market event with global supply chain implications.
Source: aljazeera.com (Mainstream Media) · View source
Status changed to developing
evidence_trigger: corroboration >= 2
signal -> developing
Iran's military command declared the Strait of Hormuz 'completely closed to all types of vessel' and threatened to target any ship attempting transit, following fresh US airstrikes on Iran. The Iranian navy reported striking two vessels attempting to pass through the strait. This represents a critical escalation affecting one of the world's most vital oil shipping chokepoints, with direct implications for marine hull, marine cargo, war risk, energy, and trade disruption lines of business.
Source: France 24 English (Mainstream Media) · View source
Initial Detection
Iran's IRGC has announced the closure of the Strait of Hormuz to all vessels in retaliation for US military strikes. The Strait of Hormuz is the world's most critical oil transit chokepoint, handling approximately 20% of global oil supply. This closure represents an existential threat to global energy supply chains, marine war risk pricing, and reinsurance treaty assumptions for the Persian Gulf.
Iran Closes Strait of Hormuz to All Vessels After US Strikes
Source: newkerala.com (Mainstream Media) · View source
Lloyd's classifications
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